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A new measurement of the branching ratio of $K_{s} \to \gamma\gamma$
The decay rate of $K_{S} \to \gamma\gamma$ has been measured with the NA48 detector at the CERN SPS. A total of 149 $K_{S} \to \gamma\gamma$ events have been observed. The branching ratio is determined to be $(2.58 \pm 0.36(stat) \pm 0.22(sys)) \times10^{-6}$.
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